A spaceship from another galaxy passes over the solar system directly above a radial line from the sun to the Earth. (We measure that distance to be 1.5 × 1011 m.) On Earth, the spaceship is observed to be traveling at a speed of 0.80 c, for which γ = 5/3. As measured on Earth it takes the spaceship 625 seconds to travel from the sun to Earth. When a scientist in the spaceship measures the Earth-sun distance and the time it takes her to travel that distance, she finds the results are respectively
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9.0 × 1010 m; 375 s.
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9.0 × 1010 m; 625 s.
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1.5 × 1011 m; 625 s.
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2.5 × 1011 m; 625 s.
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2.5 × 1011 m; 1042 s.